An analytical model of a single phase DQ-controlled inverter for power system short circuit calculations

The short-circuit contribution of Inverter interfaced systems is determined by the control architecture, generally limited to 110%-150% of rated current and is generally not sustained past a cycle or two. IEEE1574 compliant inverters with anti-islanding may trip without contributing to a fault. However, as technology moves towards ride-through for remote faults, the modeling of these inverters becomes important. Based on reasonable approximations of the controller response we derive a simple yet accurate analytical model for the fault contribution of a single phase dq-controlled inverter. The derived model is compatible with typical fault calculation programs.